DA4 - Check Resistance of Temperature Sensor - Engine Running

NOTE: Engine may have cooled down. Always warm engine before taking Engine Coolant Temperature (ECT) sensor resistance measurements. Check for open thermostat.

- Key "OFF".

- Suspect temperature sensor disconnected.

- Run engine for two minutes at 2000 rpm.

- Measure resistance between sensor signal circuit and SIG RTN circuit at the temperature sensor. Refer to the corresponding chart at the beginning of this pinpoint test for resistance specifications. DA - Sensor Data

- Is resistance within specification?

Yes -- Replace Powertrain Control Module (PCM). Reconnect vehicle harness. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)

No -- Replace suspect sensor. Reconnect vehicle harness. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)